David lynch



(No Model.)

. D. LYNCH.

TELEGRAPH TRANSMITTER FOR OCEAN GABLES. No. 592,494. Patented Oct. 26,1897.

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NITFD STATES ATENT DAVID LYNCH, OF NEW YORK, N. Y.

TELEGRAPH-TRANSMITTER FOR OCEAN-CABLES.

SPECIFICATION forming part of Letters Patent No. 592,494, dated October 26, 1897.

Application filed March 16, 1895. Renewed April 8, 1897. Serial No. 631,816. (No model.)

To coZZ whom it may concern:

Be it known that 1, DAVID LYNCH, a subject of the Queen of Great Britain, and a resident of New York, county and State of New York, have invented certain new and useful Improvements in Telegraphic Transmitters for Ocean-Cables, of which the following is a specification.

My present invention relates to an instrument for transmitting messages over an oceancable or similar telegraphic line and operated by a previouslyand suitably perforated strip of paper or similar material in sheet form.

In order to understand all the details of the invention, the accompanying drawings are annexed.

Figure 1 is a diagram of the electric circuit required in order to put my invention into operation. The connections are abnormal. Fig. 2 is a front elevation of the transmitter, showing also the parts which are to be connected up in circuit with the rest of the system. The device is in its normal condition. Fig. 3 is a perspective view of one of the details, and Fig. 4 is a plan of another detail.

A is the main line or cable, connected at opposite ends to ground B B. There are two relays, whose magnets are C O and whose terminals are D D and whose back-stops are E E, which serve also as terminals for conmeeting the circuit of the main line to ground. The terminals D D are connected to one pole of a battery F, while the other pole is connected to the terminals E E.

G G are circuit-closers provided with armatures which are adapt-ed to be attracted by the respective relay-magnets O C, so as to open the line at E or E and so as to close the circuit of the battery at D or D.

In view of the above and of what follows the magnetization of the relay-magnet Cwill send a current over the cable in one direction, while the magnetization of the magnet G will send a current over the cable in the other direction. It will be noticed that there are two local batteries F and F, respectively closed through the magnets C and O.

The means for short-circuiting the magnets C 0 consists of the following elements: H and H are electrically-connected but independently-movable levers and serve as cirthe paper. they can pass through the same and down cuit-closers and are operated by a strip of paper I, having perforations which move over grooves J on the platform K. The arbor of the levers H and H is L, and the said levers are normally held against insulated backstops M M by springs N. The levers H and H are in the path of electric terminals 0 and 0, respectively connected to the poles of the respective batteries F F. WVhen the lever H is in contact with the terminal 0, the magnet 0 is short-circuited, because the current can practically all pass from one pole of the battery through the terminal 0, the lever H to the other pole of the battery F. Similarly, when the terminal 0 is in contact with the lever H the magnet O is short-circuited.-

cated upon the platform K and fed along the same by any convenient means. While the paper is being fed, the projections P P either rest upon the paper or drop into one of the holes Q Q, arranged near opposite edges of When they drop into the holes,

into the grooves J; but it is understood that the holes are so arranged that they are not directly opposite eachother, because then the two projections P P could drop through simultaneously, which would tend to send currents of the opposite direction at the same time. It will be noticed, especially from Fig. 1, that while the projections PP rest upon the paper I the short circuits of the magnets O C are both maintained closed at the terminals 0 0, so that the main line A has in it no current, because the terminals D D are open. During this condition it may be stated that the main line is continuous from one'ground B to the other ground B, but no battery is in circuit with it. When the projection P, for example, drops into a hole Q and into the groove J under the hole, the circuit of the battery F will be open at O. The short circuit of the magnet 0 being thereby taken away, the said magnet will become thoroughly magnetized, and the circuit of the battery F will be closed at the terminal D, so that the impulse of current of a given direction will be sent over the line A. Similarly, when the projection T falls into a hole Q the lever H will open the circuit of the battery F at O,

be sent over the line.

from an arm R of a bent lever, whose other so that the magnet G will become energized if the perforations Q and Q are arranged in an arbitrary manner definite messages may The plate K projects arm is B. This lever carries aroller S, hav- 7 ing teeth S, which serve to guide the paper I, because they'pass successively into the small central equally-spaced holes T in the paper.v The guide-roller S has a handle U. A spring V retains the arm R in a position which causes the projections P and P to rest, respectively, in the grooves J By pushing the spring Vthe arm R is liberated to the dotted position r, so that the strip of paper I may be adjusted in its proper position. The paper .is further held against the grooved plate K by a spring W.

I claim as my invention y 1. In a system of telegraphy for ocean-cables, the combination with magnets for closin g currents in the linein opposite directions, of local batteries in circuit with the magnets, circuit-closers for short-circuiting the said magnets, and means for automatically opening and closing said circuit-closers at predetermined intervals.

2. In a system of telegraphy for ocean-ca determined intervals, said means consisting of levers connected with the circuit-closers and controlled by a moving perforated sheet.

3. A telegraphic transmitter for opening and closing different electric circuits, c0nsisting of circuit-closers, adapted to be operated independently of each other, and held open by the action of springs against backstops, arms for the circuit-closers, a plate having grooves in the paths of the arms supporting a moving sheet, provided with two sets of perforations and located between the said arms and the said plate in such a manner that the arms are in the paths of the perforations.

4. A telegraphic transmitter for opening and closing different electric circuits, consisting of circuit-closers, adapted to be operated independently of each other, and held open by the action of springs against back-stops, arms for the circuit-closers, a plate having grooves in the paths of the arms supporting a moving sheet, provided with two sets of perforations and located between the said arms and the said plate in such a manner that the arms are in the paths of the perforations, either circuit-closer being open when its arm is located in the groove and closed when held out of the groove by the paper.

In testimony that I claim the foregoing as my invention I have signed my name, in presence of two witnesses, this 6th day of March, 1895.

DAVID LYN OH. 

